单项选择题

When______his homework, he heard someone singing.

A. he does
B. he doing
C. doing
D. did
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单项选择题
I don't know if he is______to come to my birthday party.
A. possibly
B. likely
C. probably
D. maybe
单项选择题
People won't go out after dark because they are afraid of______.
A. attacking
B. being attacked
C. having been attacked D. attacked
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